diff --git a/Gemfile b/Gemfile
index fd2f4fa8..517aa94f 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,5 +1,5 @@
 source 'https://rubygems.org'
-ruby '2.2.5'
+ruby '2.4.1'
 
 gem 'sinatra'
 gem 'sinatra-flash'